“The voice you hear in the latter part of the story is, in fact, Stephen’s actual electronic voice as he uses it”, he told Deadline.
Eddie Redmayne has paid tribute to Stephen Hawking, who has died aged 76.
Redmayne depicted the famed scientist in James Marsh’s 2015 film The Theory of Everything, winning the Academy Award for Best Actor for the role.
Though he spent six months poring over every piece of interview footage he could find, Redmayne only met Hawking five days before filming was set to commence.